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ANGLE RULER is a ruler which can draw andle. In the daily learning life, we often need to draw angle and the most commonly used is the triangle belts of 30 °, 45 ° and 60 °. However,it's inconvenient to carry such kind of triangle belts and if you do not have them ,you can not draw an accurate angles. ANGLE RULER can solve this problem. ANGLE RULER has three slides, corresponding to 30 °, 45 ° and 60 ° three angles. When you want to draw an angle, just need to push the corresponding slide, you can draw a accurate angle.
Qin Huangdao, China